Any of the spiny, deep-rooted shrubs or small trees constituting the genus Prosopis of the pea family (Fabaceae). They form extensive thickets in areas from South America into the southwestern United States. Two races occur, one low--called running mesquite--and the other often growing into trees 15 m (50 feet) tall. The plants' roots penetrate depths of as much as 20 m (70 feet) in search of water. Their trunks may be 45 cm (18 inches) in diameter but more commonly are smaller or shrublike. In warmer parts of the United States the mesquite is considered a pest and is eradicated.

The compound leaves consist of many narrow olive-green to white hairy leaflets. The flowers occur in dense, cream-coloured catkins about 8 cm (3 inches) long and are followed by clusters of long, narrow, pale yellow beans 15-20 cm long. The beans, which contain a sweet pulp, are eaten by cattle. The wood of the mesquite, formerly used in railroad ties, is without economic value other than for unusual furniture and trinkets and for aromatic firewood.

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